Hosic, R., KREIS, Y., & Lavicza Zsolt. (17 April 2024). Beyond the Classroom: Increasing Student's self-esteem through 3D modelling [Paper presentation]. Second International Symposium on 3D Printing in Mathematics Education, Linz, Austria. |
KREIS, Y., RIVAS, S., & BUSANA, G. (23 February 2024). Unlocking Excellence: The Transformative Power of the Flipped Classroom in Initial Teacher Training [Paper presentation]. Advancing Competence in Teaching for student success: Teaching Day, Esch-sur-Alzette, Luxembourg. |
REUTER, R. A. P., KREIS, Y., & BUSANA, G. (23 February 2024). Unleashing Pedagogical Innovation: Design Projects in Initial Teacher Training [Paper presentation]. Advancing Competence in Teaching for student success: Teaching Day, Esch-sur-Alzette, Luxembourg. |
KREIS, Y. (15 January 2024). Enhancing STE(A)M Education with Emerging Technologies: The Power of Evidence Based Innovation and Creativity [Paper presentation]. Recruitment “Full Professor or Associate Professor (promotion track) for STEM Education”, Esch-sur-Alzette, Luxembourg. |
  | Houghton, T., Lavicza, Z., Weinhandl, R., Rhamadi, I. F., Békési, B., & Kreis, Y. (January 2024). Expectation shock in education: utilising industry SERVQUAL to enhance student perception of STEAM and STEAM careers. International Journal of Technology Enhanced Learning, 16 (1), 1-15. doi:10.1504/IJTEL.2024.135425  Peer Reviewed verified by ORBi |
 | Haas, B., KREIS, Y., Jablonski, S., & Cahyono, A. N. (Eds.). (06 December 2023). Learning and Teaching with Outdoor STEAM Education. Research in Integrated STEM Education, 1 (3), 373-450. Peer reviewed |
 | El Bedewy, S., Lavicza, Z., Haas, B., & KREIS, Y. (06 December 2023). STEAM Trails in Outdoor Learning Environments around the Egyptian Pyramids Complex. Research in Integrated STEM Education, 1 (3), 422-450. doi:10.1163/27726673-bja00017 Peer reviewed |
  | Haas, B., KREIS, Y., Jablonski, S., & Cahyono, A. N. (06 December 2023). Learning and Teaching with Outdoor STEAM Education. Research in Integrated STEM Education, 1 (3), 373-376. doi:10.1163/27726673-00101007 Editorial reviewed |
 | Sy Nam, P., Nguyen, N.-G., Anh Tuong, H., Haas, B., Lavicza, Z., & KREIS, Y. (September 2023). Problem-Based Learning about Error Detection and Correction in Locus Problems with the Aid of GeoGebra Software. International Journal for Technology in Mathematics Education, 30 (3), 181-190. doi:10.1564/tme_v30.3.9 Peer Reviewed verified by ORBi |
 | Haas, B., Lavicza, Z., Houghton, T., & KREIS, Y. (August 2023). Can you create? Visualising and modelling real-world mathematics with technologies in STEAM educational settings. Current Opinion in Behavioral Sciences, 52, 101297. doi:10.1016/j.cobeha.2023.101297 Peer Reviewed verified by ORBi |
KREIS, Y. (2023). Quo Vadis LPEM & MINT [Paper presentation]. WEP LPEM – Schoulentwécklung, Arlon, Belgium. |
 | Haas, B., Lavicza, Z., & Kreis, Y. (18 February 2023). Parent’s experience in remote learning during COVID-19 with digital and physical mathematical modelling. Research and Practice in Technology Enhanced Learning, 18, 21. doi:10.58459/rptel.2023.18013 Peer reviewed |
Ulbrich, E., Hosic, R., Haas, B., Tejera, M., Anđić, B., Lavicza, Z., & Kreis, Y. (16 December 2022). Connecting culture to geometry - problem based learning across subjects [Paper presentation]. Doctoral Students' Conference: Tradition, Development & Innovation in Didactics - Early Career Researchers Conference (TDID - ERC), Online, Romania. |
Ulbrich, E., El Bedewy, S., Handl, J., Andjic, B., Kreis, Y., & Lavicza, Z. (07 October 2022). 3D Modelling for AR and 3D printing in Teacher Training [Paper presentation]. International Symposium on Augmented and Virtual Reality in Mathematics Education, Online, Germany. |
Haas, B., Kreis, Y., & Lavizcza, Z. (06 October 2022). Augmented Reality in primary education: New learning opportunities for students with learning difficulties in mathematics education [Paper presentation]. International Symposium on Augmented and Virtual Reality in Mathematics Education, Online, Germany. |
Ulbrich, E., Tejera, M., Haas, B., Andjic, B., Kreis, Y., Dana-Picard, T. N., & Lavizca, Z. (12 September 2022). 3D printed mathematics visualisations by STEAM teachers [Paper presentation]. CADGME 2022 Conference, Tel Aviv & Online, Israel. |
 | Haas, B., Lavicza, Z., Houghton, T., & Kreis, Y. (17 June 2022). Evaluating Technology-Enhanced, STEAM-Based Remote Teaching With Parental Support in Luxembourgish Early Childhood Education. Frontiers in Education, 7 (872479), 1-12. doi:10.3389/feduc.2022.872479 Peer Reviewed verified by ORBi |
 | Haas, B., Kreis, Y., Lavicza, Z., Houghton, T., & Fenyvesi, K. (04 February 2022). Exploring Mathematical concepts in an Ecosystem of STEAM Learning, consisting of Physical Objects, Digital Toolkits and Tutoring Systems, 3D Printing and Outdoor Mathematical Trails [Poster presentation]. Twelfth Congress of the European Society for Research in Mathematics Education (CERME 12), Online, Italy. |
 | Haas, B., Kreis, Y., & Lavicza, Z. (October 2021). Case study on augmented reality, digital and physical modelling with mathematical learning disabilities students in an elementary school in Luxemburg. International Journal for Technology in Mathematics Education, 28 (3), 125-132. doi:10.1564/tme_v28.3.02 Peer Reviewed verified by ORBi |
 | Haas, B., Kreis, Y., & Lavicza, Z. (October 2021). Integrated STEAM Approach in Outdoor Trails with Elementary School Pre-service Teachers in Luxemburg. Educational Technology and Society, 24 (4), 205-219. Peer reviewed |
Kreis, Y., Haas, B. (24 June 2021). Iterative STEAM design in primary grades and in pre-service teacher training [Paper presentation]. CADGME Online Gathering 2021, Online, Austria. |
 | Kreis, Y., Haas, B., & Lavicza, Z. (2021). eJMT Problem Corner: June 2021. The Electronic Journal of Mathematics & Technology. Peer reviewed |
Kreis, Y., Haas, B., & Lavicza, Z. (27 May 2021). First results of the iterative STEAM design process in 3D modelling and printing with pre-service teachers [Paper presentation]. Designing Innovations in STEAM Education Conference, Online, Austria. |
Kreis, Y., & Haas, B. (07 April 2021). Transition from traditional to hybrid to online courses for pre-service elementary school teachers at the University of Luxembourg: STEAM integrated approach in the project MathEduc @ BScE [Paper presentation]. ISEP Seminars On Novel Teaching Methodologies, Online, Portugal. |
Haas, B., Kreis, Y., & Lavicza, Z. (01 April 2021). The STEAM skilled child: How children can learn to apply STEAM skills to their living environment [Paper presentation]. Regular Course on Integrating ICT in Mathematics Education for Junior High School Mathematics Teachers, Online, Indonesia. |
Haas, B., Kreis, Y., & Lavicza, Z. (25 March 2021). Mixed-methods research in STEAM outdoor trails in elementary school pre-service teacher training [Paper presentation]. Intensive training school in qualitative research design and research methods in mathematics education, Online, Slovakia. |
Kreis, Y., Haas, B., & Lavicza, Z. (19 March 2021). 3D Modelling in online learning for pre-service elementary school teachers at the University of Luxembourg [Paper presentation]. Early-Career Researchers in STEAM Education Conference, Online, Austria. |
Kreis, Y., & Haas, B. (17 February 2021). 3D modelling for pre-service primary school teachers in mathematics education [Paper presentation]. 3D printing in STEAM Education seminar, Online, Austria. |
Kreis, Y. (14 January 2021). MathEduc @ BScE [Paper presentation]. PhD Research Seminar, Online, Austria. |
Haas, B., Kreis, Y., & Lavicza, Z. (15 December 2020). Outdoor STEAM integrated framework in elementary schools in Luxembourg using MathCityMap and GeoGebra 3D Calculator [Paper presentation]. Asian Technology Conference in Mathematics (ACTM), Online, United States - Virginia. |
Haas, B., Lavicza, Z., Dana-Picard, T. N., & Kreis, Y. (10 December 2020). Transition from in-class to outdoor learning with real-world mathematical modelling: PhD research project 2015-2021 [Paper presentation]. PhD Proposal feedback, Online, Austria. |
Haas, B., Kreis, Y., & Zsolt, L. (12 November 2020). The use of augmented reality, digital and physical modelling in schooling at home in early childhood in Echternach [Paper presentation]. LuxERA (Semi-)Virtual Conference 2020, Online, Luxembourg. |
Dording, C., Max, C. J., Kreis, Y., & Latour, T. (12 November 2020). GeoGebraTAO: Geometry Learning using a Dynamic Adaptive ICT-Enhanced Environment to Promote String Differentiation of Children's Individual Pathways [Paper presentation]. LuxERA (Semi-)Virtual Conference 2020, Online, Luxembourg. |
 | Kreis, Y., Haas, B., Reuter, R., Meyers, C., & Busana, G. (2020). Reflections on our teaching activities in the initial teacher training during the COVID-19 crisis: From “onsite classes” to “schooling at home”. In G. Mein & J. Pause (Eds.), Self and Society in the Corona Crisis: Perspectives from the Humanities and Social Sciences. Esch-sur-Alzette, Luxembourg: Melusina Press. doi:10.26298/c4j7-5x48 |
 | Haas, B., Kreis, Y., & Lavicza, Z. (2020). Fostering process skills with the educational technology software MathemaTIC in elementary schools. In A. Donevska-Todorova, E. Faggiano, J. Trgalova, Z. Lavicza, R. Weinhandl, A. Clark-Wilson, ... H.-G. Weigand (Eds.), Proceedings of the 10th ERME TOPIC CONFERENCE (ETC10) on Mathematics Education in the Digital Age (MEDA) (pp. 199-206). Linz, Austria: Johannes Kepler University. Peer reviewed |
Haas, B., Lavicza, Z., & Kreis, Y. (03 July 2020). STEAM Education in elementary schools: A holistic investigation on technology enhanced teaching and learning [Paper presentation]. New Researcher's Day Conference, Online, United Kingdom. |
 | Haas, B., Kreis, Y., & Lavicza, Z. (July 2020). Connecting the real world to mathematical models in elementary schools in Luxemburg. Proceedings of the British Society for Research into Learning Mathematics, 40 (2), 1-6. Peer reviewed |
Haas, B., Lavicza, Z., & Kreis, Y. (25 June 2020). STEAM in special needs education in an elementary school in Luxemburg [Paper presentation]. INSTEAD VI - Workshop on Innovative Teaching Methodologies for Math Courses on Engineering Degrees, Online, Portugal. |
Haas, B., & Kreis, Y. (23 June 2020). Innovative uses of technologies for STEAM education in elementary schools in Luxemburg [Paper presentation]. CADGME Online Gathering 2020, Online, Austria. |
 | Parmentier, Y., Reuter, R., Higuet, S., Kataja, L., Kreis, Y., Duflot-Kremer, M., Laduron, C., Meyers, C., Busana, G., Weinberger, A., & Denis, B. (23 June 2020). PIAF: Developing Computational and Algorithmic Thinking in Fundamental Education. Proceedings of EdMedia + Innovate Learning, 2020 (1), 315-322. Peer reviewed |
 | Lavicza, Z., Haas, B., & Kreis, Y. (2020). Discovering Everyday Mathematical Situations Outside the Classroom with MathCityMap and GeoGebra 3D. In M. Ludwig, S. Jablonski, A. Caldeira, ... A. Moura (Eds.), Research on Outdoor STEM Education in the digiTal Age: Proceedings of the ROSETA Online Conference in June 2020 (pp. 23-30). Münster, Germany: WTM. doi:10.37626/GA9783959871440.0.03 |
 | Busana, G., Denis, B., Duflot-Kremer, M., Higuet, S., Kataja, L., Kreis, Y., Laduron, C., Meyers, C., Parmentier, Y., Reuter, R., & Weinberger, A. (06 February 2020). PIAF : développer la Pensée Informatique et Algorithmique dans l'enseignement Fondamental [Poster presentation]. Didapro 8 – DidaSTIC: L’informatique, objets d’enseignements – enjeux épistémologiques, didactique et de formation, Lille, France. |
Haas, B., & Kreis, Y. (17 January 2020). Fostering process related skills in mathematics though educational technology in elementary schools [Paper presentation]. Pedagogical Innovations in STEAM Education Conference, Linz, Austria. |
Kreis, Y. (2020). Dynamische Mathematik mit GeoGebra – 3D-Grafikfenster [Paper presentation]. Formation Continue Interne, Junglinster, Luxembourg. |
Kreis, Y. (2019). Dynamische Mathematik mit GeoGebra – Evaluation [Paper presentation]. Formation Continue Interne, Junglinster, Luxembourg. |
Kreis, Y. (24 April 2019). Flipped classroom and didactic approach in big classrooms [Paper presentation]. Teaching Showcase, Belval, Luxembourg. |
 | Kreis, Y., Dording, C., Keller, U., Porro, V., & Jadoul, R. (2018). Dynamische Mathematik und computergestützte Tests: GeoGebra in TAO. In S. Ladel, J. Knopf, ... A. Weinberger (Eds.), Digitalisierung und Bildung (pp. 59-80). Wiesbaden, Germany: Springer VS. doi:10.1007/978-3-658-18333-2_4 |
Kreis, Y. (2017). 7O = 3D [Paper presentation]. Journée expert externe, Dudelange, Luxembourg. |
Kreis, Y. (2017). Dynamische Mathematik mit GeoGebra – 3D-Grafikfenster [Paper presentation]. Formation Continue Interne, Esch-sur-Alzette, Luxembourg. |
 | Haas, B., Kesting, F., Martin, R., Kreis, Y., & Koenig, V. (2017). Die Lernplattform MathemaTIC: Digitales Erlernen der kognitiven Prozesse im Sachrechnen im Alter von 8 bis 10 Jahren. In U. Kortenkamp & A. Kuzle (Eds.), Beiträge zum Mathematikunterricht 2017 (pp. 1333-1336). Münster, Germany: WTM-Verlag. |
Pelt, V., Ugen, S., Milmeister, M., Weis, C., & Kreis, Y. (2017). Évaluation du projet d’innovation pédagogique : L’allemand comme langue véhiculaire dans le cours de mathématiques au cycle inférieur de l’EST à l’ALR. Rapport détaillé. Année 1. Luxembourg: MENJE/SCRIPT. |
Pelt, V., Ugen, S., Milmeister, M., Weis, C., & Kreis, Y. (2017). Évaluation du Projet pilote : Le Cours de Mathématiques en Allemand au Maacher Lycée. Rapport détaillé. Année 1. Luxembourg: MENJE/SCRIPT. |
 | Haas, B., Kreis, Y., Koenig, V., & Martin, R. (21 November 2016). L’utilisation de l’environnement numérique MathemaTIC pour développer les compétences dans le domaine de la résolution de problèmes arithmétiques [Paper presentation]. Évaluation en mathématiques : dispositifs, validités & pratiques, Paris, France. |
Kreis, Y. (2016). Dynamische Mathematik mit GeoGebra – Grafikfenster und Tabellenkalkulation [Paper presentation]. Formation Continue Interne, Dudelange, Luxembourg. |
 | Kreis, Y., Bertemes, J., Kafai-Afif, A., & Haas, B. (29 July 2016). The personalized and multilingual mathematical learning environment MathemaTIC [Paper presentation]. 13th International Congress on Mathematical Education, Hamburg, Germany. |
 | Haas, B., Martin, R., & Kreis, Y. (29 July 2016). Using interactive items in arithmetic problems to help Grade 3 students shift from intuitive to arithmetic-based strategies and create mental representation [Poster presentation]. 13th International Congress on Mathematical Education, Hamburg, Germany. |
 | Dording, C., Martin, R., Kreis, Y., & Latour, T. (26 July 2016). GeoGebraTAO, validation of an adaptive learning environment of dynamic geometry. Source of a differentiation individual pathway of the student? [Paper presentation]. 13th International Congress on Mathematical Education, Hamburg, Germany. |
Kreis, Y. (2016). Dynamische Mathematik mit GeoGebra – Algebra- und 3D-Grafikfenster [Paper presentation]. Formation Continue Interne, Luxembourg, Luxembourg. |
Kreis, Y. (28 June 2016). Dynamische Mathematik in der Grundschule [Paper presentation]. Ringvorlesung "Digitalisierung und Bildung", Saarbrücken, Germany. |
Kreis, Y. (2016). Dynamische Mathematik mit GeoGebra – Algebra- und 3D-Grafikfenster [Paper presentation]. Formation Continue Interne, Diekirch, Luxembourg. |
Kreis, Y. (2016). Dynamische Mathematik mit GeoGebra – Algebra- und 3D-Grafikfenster [Paper presentation]. Formation Continue Interne, Luxembourg, Luxembourg. |
Kreis, Y., Kafai-Afif, A., Haas, B., & Reinert, A. (08 March 2016). Die personalisierte und mehrsprachige mathematische Lernumgebung MathemaTIC [Paper presentation]. 50. Jahrestagung der Gesellschaft für Didaktik der Mathematik (GDM), Heidelberg, Germany. |
Dording, C., Martin, R., Kreis, Y., & Latour, T. (08 March 2016). GeoGebraTAO - eine dynamische Software für ein niveauangemessenes selbstständiges Arbeiten in Geometrie? [Paper presentation]. 50. Jahrestagung der Gesellschaft für Didaktik der Mathematik (GDM), Heidelberg, Germany. |
Kreis, Y. (2016). Intégrer l´outil informatique dans le cours de mathématiques (Geogebra/Excel) [Paper presentation]. Formation Continue Interne, Luxembourg, Luxembourg. |
Kreis, Y., Bertemes, J., Kafai-Afif, A., Haas, B., & Arzoumanian, P. (25 November 2015). MathemaTIC [Paper presentation]. European Association for Practitioner Research on Improving Learning (EAPRIL) 2015 Conference, Esch-sur-Alzette, Luxembourg. |
Dording, C., Martin, R., Kreis, Y., & Latour, T. (24 November 2015). GeoGebraTAO, validation of an Adaptive Learning Environment of dynamic geometry. Source of a differentiation individual pathway of the student? [Poster presentation]. European Association for Practitioner Research on Improving Learning (EAPRIL) 2015 Conference, Esch-sur-Alzette, Luxembourg. |
Kreis, Y. (2014). Dynamische Mathematik mit GeoGebra – Algebrafenster [Paper presentation]. Formation Continue Interne, Luxembourg, Luxembourg. |
Kreis, Y. (2013). Dynamische Mathematik mit GeoGebra – Grafikfenster und Tabellenkalkulation [Paper presentation]. Formation Continue Interne, Luxembourg, Luxembourg. |
Kreis, Y. (2012). Dynamische Mathematik mit GeoGebra [Paper presentation]. Formation Continue Interne, Esch-sur-Alzette, Luxembourg. |
Kreis, Y. (2012). Dynamische Mathematik mit GeoGebra [Paper presentation]. Formation Continue Interne, Esch-sur-Alzette, Luxembourg. |
 | Kreis, Y. (2012). Entdeckendes Lernen im Mathematikunterricht der Grundschule: Natürliche Zahlen. (3. Aufl). Walferdange, Luxembourg: University of Luxembourg. |
Kreis, Y. (2011). Dynamische Mathematik mit GeoGebra [Paper presentation]. Formation Continue Interne, Redange, Luxembourg. |
Hohenwarter, M., Borcherds, M., Ancsin, G., Blossier, M., Denizet, C., Fekete, A., Konecny, Z., Kovacs, Z., Kreis, Y., Sonner, F., Sturr, G., & Ulven, H.-P. (2011). GeoGebra. Saalfelden, Austria: International GeoGebra Institute. |
Kreis, Y., & Jadoul, R. (30 March 2011). GeoGebra(Mobile) and TAO 2.0: Unleashing the power of assessment in geometry [Paper presentation]. TAO Days 2011, Luxembourg, Luxembourg. |
 | Lavicza, Z., Hohenwarter, M., Jones, K., Dawes, M., & Kreis, Y. (10 February 2011). Establishing a Professional Development Network in England around Dynamic Mathematics Software [Poster presentation]. CERME 7 - Seventh Conference of European Research in Mathematics Education, Rzeszów, Poland. |
Kreis, Y. (2011). Dynamische Mathematik mit GeoGebra [Paper presentation]. Formation Continue Interne, Luxembourg, Luxembourg. |
Kreis, Y. (2011). Dynamische Mathematik mit GeoGebra [Paper presentation]. Formation Continue Interne, Esch-sur-Alzette, Luxembourg. |
 | Kreis, Y. (2011). Entdeckendes Lernen im Mathematikunterricht der Grundschule: Geometrie. (2. Aufl). Walferdange, Luxembourg: University of Luxembourg. |
 | Egido, S., Hendriks, M., Kreis, Y., Kortenkamp, U., Marquès, D., Hohenwarter, M. (Other coll.), Laborde, J.-M. (Other coll.), & Libbrecht, P. (Other coll.). (2010). i2g Common File Format Final Version. (3.10). |
Kreis, Y. (27 July 2010). GeoGebra - Dynamic Mathematics for Everyone [Paper presentation]. The First North American GeoGebra Conference, Ithaca, NY, United States. |
Kreis, Y., & Kortenkamp, U. (02 July 2010). Technical Aspects of Intergeo [Paper presentation]. Interoperable Interactive Geometry (I2GEO) Conference 2010, Hluboká nad Vltavou, Czechia. |
Kreis, Y., Dording, C., & Keller, U. (30 June 2010). GeoGebraPrim - GeoGebra for Primary School [Paper presentation]. Computer Algebra and Dynamic Geometry Systems in Mathematics Education (CADGME) 2010, Hluboká nad Vltavou, Czechia. |
Kreis, Y., & Hohenwarter, M. (29 June 2010). The Future of GeoGebra [Paper presentation]. Computer Algebra and Dynamic Geometry Systems in Mathematics Education (CADGME) 2010, Hluboká nad Vltavou, Czechia. |
 | Chrysanthou, I., Hohenwarter, J., Hohenwarter, M., Hreinsdóttir, F., Kreis, Y., Lavicza, Z., Lindner, A., Papp-Varga, S., Parish, A., Recio, T., Sanne, A., Stepancik, E., & Winkowska‐Nowak, K. (2010). First International GeoGebra Conference 2009. |
 | Kortenkamp, U., Blessing, A. M., Dohrmann, C., Kreis, Y., Libbrecht, P., & Mercat, C. (2010). Interoperable Interactive Geometry for Europe - First Technological and Educational results and future challenges of the Intergeo project. In V. Durand-Guerrier, S. Soury-Lavergne, ... F. Arzarello (Eds.), Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education (pp. 1150-1160). Lyon, France: Institut National de Recherche Pédagogique (INRP). Peer reviewed |
 | Kortenkamp, U., & Kreis, Y. (2010). Konstruktionsbeschreibungen und DGS. In A. M. Lindmeier & S. Ufer (Eds.), Beiträge zum Mathematikunterricht 2010 (pp. 501-504). Münster, Germany: WTM-Verlag. doi:10.17877/DE290R-13520 |
 | Kreis, Y., Dording, C., Porro, V., & Jadoul, R. (2010). Dynamic mathematics and computer-assisted testing: GeoGebra inside TAO. In U. Kortenkamp, P. Pech, C. Dohrmann, ... R. Hašek (Eds.), Proceedings of the Interoperable Interactive Geometry Conference 2010. Peer reviewed |
 | Kreis, Y., Dording, C., & Keller, U. (2010). GeoGebraPrim - GeoGebra in der Grundschule. In A. M. Lindmeier & S. Ufer (Eds.), Beiträge zum Mathematikunterricht 2010 (pp. 513-516). Münster, Germany: WTM-Verlag. doi:10.17877/DE290R-13545 |
 | Kreis, Y. (14 November 2009). The project GeoGebraPrim - GeoGebra for Primary School [Paper presentation]. GeoGebra, un instrument per al desenvolupament de les competències matemàtiques de l'alumnat de Primària, de l'ESO i del Batxillerat, Barcelona, Spain. |
 | Hendriks, M., Kortenkamp, U., Kreis, Y., Marquès, D., Badia, E. (Other coll.), Egido, S. (Other coll.), & Wassermann, A. (Other coll.). (2009). Report on Implementations of the Common File Format. (3.8). |
 | Hendriks, M., Kortenkamp, U., Kreis, Y., Marquès, D., Grothmann, R. (Other coll.), Hohenwarter, M. (Other coll.), Laborde, J.-M. (Other coll.), & Schandeler, I. (Other coll.). (2009). i2g Common File Format Draft v2. (3.6). |
Hohenwarter, M., & Kreis, Y. (15 July 2009). Software Development & Online Systems: Extensions [Paper presentation]. First International GeoGebra Conference, Hagenberg, Austria. |
Hohenwarter, M., & Kreis, Y. (14 July 2009). Software Development & Online Systems: CAS [Paper presentation]. First International GeoGebra Conference, Hagenberg, Austria. |
Kortenkamp, U., Abánades, M., Botana, F., Dohrmann, C., Escribano, J., Kreis, Y., Recio, T., & Wassermann, A. (13 July 2009). Intergeo: fostering the use of Dynamic Geometry Software in Europe [Paper presentation]. Computer Algebra and Dynamic Geometry Systems in Mathematics Education (CADGME) 2009, Hagenberg, Austria. |
Kreis, Y., Hohenwarter, M., & Hohenwarter, J. (12 July 2009). GeoGebra 3.2 – The new Spreadsheet View [Paper presentation]. Computer Algebra and Dynamic Geometry Systems in Mathematics Education (CADGME) 2009, Hagenberg, Austria. |
Kreis, Y., & Dording, C. (11 July 2009). GeoGebraPrim - GeoGebra for Primary School [Paper presentation]. Computer Algebra and Dynamic Geometry Systems in Mathematics Education (CADGME) 2009, Hagenberg, Austria. |
Kreis, Y., & Lavicza, Z. (06 July 2009). International GeoGebra Institute: nurturing a community to assist the integration of the open-source mathematics software GeoGebra into mathematics teaching [Paper presentation]. The Ninth International Conference on Technology in Mathematics Teaching (ICTMT 9), Metz, France. |
Hohenwarter, M., Borcherds, M., & Kreis, Y. (2009). GeoGebra. Saalfelden, Austria: GeoGebra Inc. |
 | Kortenkamp, U., Kreis, Y. (Other coll.), Libbrecht, P. (Other coll.), & Marquès, D. (Other coll.). (2009). I2G API Specification. (3.5). |
Kreis, Y. (2009). Dynamische Mathematik mit GeoGebra - Planung, Organisation und Realisierung von Unterrichtseinheiten [Paper presentation]. Formation Continue Interne, Luxembourg, Luxembourg. |
Kreis, Y. (2009). Dynamische Mathematik mit GeoGebra - Planung, Organisation und Realisierung von Unterrichtseinheiten [Paper presentation]. Formation Continue Interne, Luxembourg, Luxembourg. |
Kreis, Y. (2009). Dynamische Mathematik mit GeoGebra - Planung, Organisation und Realisierung von Unterrichtseinheiten [Paper presentation]. Formation Continue Interne, Grevenmacher, Luxembourg. |
 | Kortenkamp, U., Dohrmann, C., Kreis, Y., Dording, C., Libbrecht, P., & Mercat, C. (2009). Using the Intergeo Platform for Teaching and Research. In C. Bardini, P. Fortin, A. Oldknow, ... D. Vagost (Eds.), Proceedings of the 9th International Conference on Technology in Mathematics Teaching (pp. 1-5). Metz, France: ICTMT 9. Peer reviewed |
 | Kreis, Y., Hohenwarter, M., & Hohenwarter, J. (2009). GeoGebra 3.2 - The new Spreadsheet View. In C. Bardini, P. Fortin, A. Oldknow, ... D. Vagost (Eds.), Proceedings of the 9th International Conference on Technology in Mathematics Teaching. Metz, France: ICTMT 9. Peer reviewed |
 | Linckels, S., Kreis, Y., Reuter, R., Dording, C., Weber, C., & Meinel, C. (2009). Teaching with Information and Communication Technologies: Results of a Large Scale Survey. In G. Farally-Semerad, K. McRitchie, ... B. Rugg (Eds.), SIGUCCS '09: Proceedings of the 37th annual ACM SIGUCCS fall conference: communication and collaboration (pp. 157-162). New York, United States: ACM. doi:10.1145/1629501.1629530 Peer reviewed |
 | Abánades, M., Botana, F., Escribano, J., Hendriks, M., Kortenkamp, U., Kreis, Y., Libbrecht, P., Marques, D., & Mercat, C. (2009). The Intergeo File Format in Progress. In J. H. Davenport (Ed.), Proceedings of the 22nd OpenMath Workshop (pp. 17-30). Bath, United Kingdom: University of Bath Press & OpenMath Society. Peer reviewed |
 | Kreis, Y., & Dording, C. (2009). GeoGebraPrim - GeoGebra for Primary School. In C. Bardini, P. Fortin, A. Oldknow, ... D. Vagost (Eds.), Proceedings of the 9th International Conference on Technology in Mathematics Teaching (pp. 1-5). Metz, France: ICTMT 9. Peer reviewed |
Kreis, Y. (29 October 2008). New perspectives on the use of GeoGebra for improving teaching quality [Paper presentation]. I Jornada de l'Associació Catalana de GeoGebra (ACG), Barcelona, Spain. |
 | Hendriks, M., Kortenkamp, U., Kreis, Y., Marquès, D., Grothmann, R. (Other coll.), Hohenwarter, M. (Other coll.), Laborde, J.-M. (Other coll.), Libbrecht, P. (Other coll.), & Schandeler, I. (Other coll.). (2008). Common File Format v1. (3.3). |
Hohenwarter, M., Hohenwarter, J., Kreis, Y., & Lavicza, Z. (09 July 2008). Mathematics teacher development and technology: towards an International GeoGebra Institute [Poster presentation]. 11th International Congress on Mathematical Education (ICME 11), Monterrey, Mexico. |
Hohenwarter, M., Hohenwarter, J., Kreis, Y., & Lavicza, Z. (09 July 2008). GeoGebra – free dynamic mathematics software [Paper presentation]. 11th International Congress on Mathematical Education (ICME 11), Monterrey, Mexico. |
Kortenkamp, U., Kreis, Y., & Laborde, J.-M. (09 July 2008). Intergeo - Interoperable Interactive Geometry for Europe [Poster presentation]. 11th International Congress on Mathematical Education (ICME 11), Monterrey, Mexico. |
Hohenwarter, M., Hohenwarter, J., Kreis, Y., & Lavicza, Z. (09 July 2008). GeoGebra – free software for dynamic geometry, algebra and calculus [Poster presentation]. 11th International Congress on Mathematical Education (ICME 11), Monterrey, Mexico. |
 | Hohenwarter, M., Hohenwarter, J., Kreis, Y., & Lavicza, Z. (08 July 2008). Teaching and Learning Calculus with Free Dynamic Mathematics Software GeoGebra [Paper presentation]. 11th International Congress on Mathematical Education (ICME 11), Monterrey, Mexico. |
Kreis, Y. (07 May 2008). GeoGebra-related activities at the University of Luxembourg [Paper presentation]. First Meeting of the International GeoGebra Institute (IGI), Cambridge, United Kingdom. |
Hohenwarter, M., Borcherds, M., & Kreis, Y. (2008). GeoGebra. |
Kreis, Y. (13 March 2008). Kann ein DGS den Geometrieunterricht für alle Kinder verändern? [Paper presentation]. 5e Rencontre Internationale Pédagogie & Psychologie: Rechenschwierigkeiten (Beschreibung - Diagnostik - Förderung), Luxembourg, Luxembourg. |
Kreis, Y., Schandeler, I., & Libbrecht, P. (01 February 2008). Intergeo - Interoperable Interactive Geometry for Europe [Paper presentation]. 3rd JEM Workshop, Barcelona, Spain. |
 | Hendriks, M., Ippersiel, M., Kortenkamp, U., Kreis, Y., Laborde, C., Pech, P., Recio, T., & Wassermann, A. (2008). Status quo report on DGS usage. (5.1). |
 | Kreis, Y., Busana, G., & Meyers, C. (2008). Negative Zahlen in der Grundschule. In É. Vásárhelyi (Ed.), Beiträge zum Mathematikunterricht 2008 (pp. 537-540). Münster, Germany: WTM-Verlag. doi:10.17877/DE290R-11535 |
 | Hohenwarter, M., Kreis, Y., & Lavisca, Z. (2008). Technology professional development and research collaboration: Towards an International GeoGebra Institute. In É. Vásárhelyi (Ed.), Beiträge zum Mathematikunterricht 2008 (pp. 307-310). Münster, Germany: WTM-Verlag. doi:10.17877/DE290R-11752 |
 | Kortenkamp, U., & Kreis, Y. (2008). Intergeo - Interoperable Interactive Geometry for Europe. In É. Vásárhelyi (Ed.), Beiträge zum Mathematikunterricht 2008 (pp. 396-399). Münster, Germany: WTM-Verlag. doi:10.17877/DE290R-11533 |
 | Kreis, Y. (2007). Entdeckendes Lernen im Mathematikunterricht der Grundschule: Natürliche Zahlen. (2. Aufl). Walferdange, Luxembourg: University of Luxembourg. |
 | Kreis, Y. (2007). Entdeckendes Lernen im Mathematikunterricht der Grundschule: Brüche und Dezimalzahlen. (2. Aufl). Walferdange, Luxembourg: University of Luxembourg. |
 | Kreis, Y. (2007). Entdeckendes Lernen im Mathematikunterricht der Grundschule: Geometrie. Walferdange, Luxembourg: University of Luxembourg. |
Hohenwarter, M., & Kreis, Y. (2006). GeoGebra. |
 | Kreis, Y. (2006). Entdeckendes Lernen im Mathematikunterricht der Grundschule: Brüche und Dezimalzahlen. Walferdange, Luxembourg: University of Luxembourg. |
 | Kreis, Y. (2006). Entdeckendes Lernen im Mathematikunterricht der Grundschule: Natürliche Zahlen. Walferdange, Luxembourg: University of Luxembourg. |
 | Kreis, Y. (2006). Entdeckendes Lernen im Mathematikunterricht der Grundschule: Projekte. (2. Aufl). Walferdange, Luxembourg: University of Luxembourg. |
 | Kreis, Y. (2005). Eignet sich die semi-konkrete Darstellungsform Pfeilsprache als nonverbale Kommunikationsmöglichkeit im aktiv-entdeckenden Mathematikunterricht? [Doctoral thesis, University of Education Ludwigsburg]. ORBilu-University of Luxembourg. https://orbilu.uni.lu/handle/10993/46722 |
 | Kreis, Y. (2005). Eignet sich die semi-konkrete Darstellungsform Pfeilsprache als nonverbale Kommunikationsmöglichkeit im aktiv-entdeckenden Mathematikunterricht? Luxembourg, Luxembourg: Ministère de l’Éducation nationale et de la Formation professionnelle. |
 | Kreis, Y. (2005). Entdeckendes Lernen im Mathematikunterricht der Grundschule: Projekte. Walferdange, Luxembourg: University of Luxembourg. |
 | Kreis, Y. (2004). Mathé mat TIC Intégration de l'outil informatique dans le cours de mathématiques de la classe de 4e [Bachelor/master dissertation, Ministère de l’Éducation nationale et de la Formation professionnelle (MENFP]. ORBilu-University of Luxembourg. https://orbilu.uni.lu/handle/10993/47227 |
 | Kreis, Y. (2002). MATHE MAT TIC [Bachelor/master dissertation, Centre Universitaire de Luxembourg]. ORBilu-University of Luxembourg. https://orbilu.uni.lu/handle/10993/47228 |
Kreis, Y. (1998). Iterative Methoden für Pseudospektralverfahren zur Lösung von Randwertproblemen [Bachelor/master dissertation, Universität Freiburg]. ORBilu-University of Luxembourg. https://orbilu.uni.lu/handle/10993/47229 |
